Reliability Analysis of Thick-Walled Laminated and Textile Composite Structures

摘要

The report concludes first year of work on the project. According to the Plan ofWork and Deliverables, this contains: (1) A literature review of Soviet research on composite materials and their structural applications. (2) A literature review of Soviet research on the theory of reliability, stochastic processes and their applications to the analysis of laminated composite shell structures. (3) New theoretical development of the reliability prediction methodology of laminated composite plates and cylindrical shells under random loading, with account for random scatters in the material elastic and strength characteristics. (4) A computer code for reliability analysis of laminated composite cylindrical shells (plates can be considered as particular case) with account for the random effects mentioned in (3). In the review presented in Chapter 1, a broad spectrum of technological problems of creating thick-walled wound composite shells of revolution is addressed. The advantages and disadvantages of the known winding methods available in open literature are thoroughly discussed in the context of creating favorable fields of residual stresses and minimizing the material and structural irregularities and imperfections. Chapter 2 provides a theoretical background on the theory of probability, stochastic processes, and reliability which is used in Chapters 3 and 4. In the review presented in Chapter 3, experimental and theoretical works on stochastic deformation and failure of composite materials and structures are comprehensively studied. Fundamentals of the modeling of stochastic damage accumulation are reviewed. Applications of the Monte Carlo computer simulation technique for stochastic failure analysis of unidirectional composites and wound composite shells of revolution are considered.